scholarly journals Coordinately expressed chorion genes of Bombyx mori: is developmental specificity determined by secondary structure recognition?

1983 ◽  
Vol 2 (9) ◽  
pp. 1431-1440 ◽  
Author(s):  
K. Iatrou ◽  
S.G. Tsitilou
Keyword(s):  
Secondary Structure ◽  
Bombyx Mori ◽  
Chorion Genes ◽  
Structure Recognition

scholarly journals Evolution of a multigene family of chorion proteins in silkmoths.

1982 ◽  
Vol 2 (5) ◽  
pp. 554-563 ◽  
Author(s):  
G C Rodakis ◽  
N K Moschonas ◽  
F C Kafatos
Keyword(s):  
Protein Structure ◽  
Bombyx Mori ◽  
Dna Sequences ◽  
Multigene Family ◽  
Antheraea Polyphemus ◽  
Antheraea Pernyi ◽  
Chorion Genes ◽  
Base Substitutions ◽  
New Protein

The evolution of the A family of chorion genes was examined by comparing new protein and DNA sequences from the silkmoths Antheraea pernyi and Bombyx mori with previously known sequences from Antheraea polyphemus. The comparisons indicated that the A family and its major subfamilies are ancient and revealed how parts of the genes corresponding to distinct regions of the protein structure have evolved, both by base substitutions and by segmental reduplications and deletions.

scholarly journals Chromosomal fragment responsible for genetic mosaicism in larval body marking of the silkworm, Bombyx mori

1991 ◽  
Vol 57 (1) ◽  
pp. 11-16 ◽  
Author(s):  
Haruhiko Fujiwara ◽  
Osamu Ninaki ◽  
Masahiko Kobayashi ◽  
Jun Kusuda ◽  
Hideaki Maekawa
Keyword(s):  
Bombyx Mori ◽  
Short Chromosome ◽  
Larval Body ◽  
Chromosomal Fragment ◽  
X Ray ◽  
Chorion Genes ◽  
Genetic Mosaicism ◽  
Chromosome Fragments ◽  
Dna Fragment ◽  
Silkworm Bombyx Mori

SummarySeveral genetic mosaics for larval body marking of the silkworm, Bombyx mori, have been induced by X-ray irradiation. It is hypothesized that the occasional loss of chromosomal fragments carrying the genes for body marking during development may give rise to this type of mosaicism. Using pulsed field gel electrophoresis (PFGE), we find that a DNA molecule of about 2·5 megabases (Mb) is present in one type of mosaic (mottled striped strains pSm788 and pSm872), and not in any other strain. This DNA fragment hybridizes strongly with some chorion genes which are less than 6·9 cM away from the ps locus, and hence it corresponds to a chromosomal fragment containing genes for both striped marking (ps) and the chorion. In the non-mottled ps strain, the phenotype before X-ray irradiation, no band was detected either on a PFGE gel or after hybridization with the chorion probe. These results suggest that the mottled ps strains carry short chromosome fragments which are lost differentially during cell divisions.

Silk Fibroin: A Promising Biomaterial

2011 ◽  
Vol 409 ◽  
pp. 99-104 ◽  
Author(s):  
Mariana Agostini de Moraes ◽  
Mariana Ferreira Silva ◽  
Raquel Farias Weska ◽  
Marisa Masumi Beppu
Keyword(s):  
Tissue Engineering ◽  
Controlled Release ◽  
Secondary Structure ◽  
Bombyx Mori ◽  
Structural Properties ◽  
Silk Fibroin ◽  
Protein Secondary Structure ◽  
Processing Conditions ◽  
Protein Fiber

Silk fibroin (SF) is a protein fiber spun by Bombyx mori silkworm. SF fibers are about 10-25 μm wide in diameter and a single cocoon may provide over 1000 m of SF fibers. SF can present several conformations regarding protein secondary structure which ultimately define the structural properties of SF-based materials. For this reason, a rigorous control on its processing conditions shall be performed. It is known that SF has excellent properties to be used in biomaterials field, controlled release and scaffolds for tissue engineering. In addition, SF can be processed in several forms, such as films, fibers, hydrogels or microparticles. This work seeks to provide an overview on SF processing conditions, regarding the preparation of SF membranes (dense and porous), hydrogels and biocomposites, focusing on biomaterials application.

Developmental classes and homologous families of chorion genes in Bombyx mori

1982 ◽  
Vol 157 (3) ◽  
pp. 417-434 ◽  
Author(s):  
Kostas Iatrou ◽  
Sonia G. Tsitilou ◽  
Fotis C. Kafatos
Keyword(s):  
Bombyx Mori ◽  
Chorion Genes

Evolution of a multigene family of chorion proteins in silkmoths

1982 ◽  
Vol 2 (5) ◽  
pp. 554-563
Author(s):  
G C Rodakis ◽  
N K Moschonas ◽  
F C Kafatos
Keyword(s):  
Protein Structure ◽  
Bombyx Mori ◽  
Dna Sequences ◽  
Multigene Family ◽  
Antheraea Polyphemus ◽  
Antheraea Pernyi ◽  
Chorion Genes ◽  
Base Substitutions ◽  
New Protein

The evolution of the A family of chorion genes was examined by comparing new protein and DNA sequences from the silkmoths Antheraea pernyi and Bombyx mori with previously known sequences from Antheraea polyphemus. The comparisons indicated that the A family and its major subfamilies are ancient and revealed how parts of the genes corresponding to distinct regions of the protein structure have evolved, both by base substitutions and by segmental reduplications and deletions.

Protein Secondary Structure Recognition Procedure

2007 ◽  
Vol 39 (8) ◽  
pp. 65-71 ◽  
Author(s):  
Boris A. Beletskiy ◽  
Sergey V. Vasilyev ◽  
Alexandra A. Vagis ◽  
Anatoliy M. Gupal
Keyword(s):  
Secondary Structure ◽  
Protein Secondary Structure ◽  
Recognition Procedure ◽  
Structure Recognition

scholarly journals ORGANIZATION OF THE CHORION GENES OF BOMBYX MORI, A MULTIGENE FAMILY. II. PARTIAL LOCALIZATION OF THREE GENE CLUSTERS

Genetics ◽  
1979 ◽  
Vol 92 (4) ◽  
pp. 1173-1185
Author(s):  
Marian R Goldsmith ◽  
Eileen Clermont-Rattner
Keyword(s):  
Bombyx Mori ◽  
Isoelectric Focusing ◽  
Gene Order ◽  
Multigene Family ◽  
Gene Clusters ◽  
Electrophoretic Variants ◽  
Chorion Genes

ABSTRACT Chorion genes of the inbred stock Ascoli have been localized to three linked clusters by analysis of testcross progeny. Electrophoretic variants screened by isoelectric focusing served as markers. The clusters are designated Ch 1, Ch 2, and Ch 3. The gene order is Ch 1-Ch 2-Ch 3-Y, with relative map distances of approximately 0.4 m.u. for Ch 1-2, 3.3 ± 0.9 m.u. for Ch 2-3, and 21 m.u. for Ch 3-Y. In a separate testcross using different markers, two chorion regions were localized 2.3 mu. and 3.1 mu. from p. These markers could not be assigned to Ch 1, 2, or 3 because there is at present no test for allelism in this system.

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